科研之友
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摘要
To improve the separation capacity of uranium in aqueous solutions, 3R-MoS2 nanosheets were prepared with molten salt electrolysis and further modified with polypyrrole (PPy) to synthesize a hybrid nanoadsorbent (PPy/3R-MoS2). The preparation conditions of PPy/3RMo S2 were investigated and the obtained nanosheets were characterized with scanning electron microscope (SEM), high resolution transmission electron microscope (HRTEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS). The results showed that PPy/3R-MoS2 exhibited enhanced adsorption capacity toward U(Ⅵ) compared to pure 3R-MoS2 and PPy; the maximum adsorption was 200.4 mg/g. The adsorption mechanism was elucidated with XPS and FTIR:(1) negatively charged PPy/3R-Mo S2 nanosheets attracted UO22+by an electrostatic interaction;(2) exposed C, N, Mo, and S atoms complexed with U(Ⅵ) through coordination;(3) Mo in the complex partly reduced the adsorbed U(Ⅵ) to U(Ⅳ), which further regenerated the adsorption point and continuously adsorbed U(VI). The design of the PPy/3R-MoS2 composite with a high adsorption capacity and chemical stability provides a new direction for the removal of radionuclide.
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